161402837858 has 4 divisors (see below), whose sum is σ = 242104256790. Its totient is φ = 80701418928.

The previous prime is 161402837807. The next prime is 161402837861. The reversal of 161402837858 is 858738204161.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 82965313369 + 78437524489 = 288037^2 + 280067^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40350709463 + ... + 40350709466.

Almost surely, 2^161402837858 is an apocalyptic number.

161402837858 is a deficient number, since it is larger than the sum of its proper divisors (80701418932).

161402837858 is an equidigital number, since it uses as much as digits as its factorization.

161402837858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80701418931.

The product of its (nonzero) digits is 2580480, while the sum is 53.

The spelling of 161402837858 in words is "one hundred sixty-one billion, four hundred two million, eight hundred thirty-seven thousand, eight hundred fifty-eight".